It is possible but its extremely rare. If they screw up your application, they will process it faster. I know a person whose SINP nomination took more than an year, but it should have been 4 months. Therefore SINP recommended CIC to process it faster and it was indeed processed in 6 months. Another possibility is if you have strong and valid political and media pressure to your application. Also, under serious natural calamities, and if you are affected by them, your application will be processed quickly.